Officers were called to the Spar store in Dudley shortly before 9pm on Friday, February 11, after receiving a report of a robbery.
Nobody was injured however the staff who were present were left shaken as a result of the incident.
An investigation into the robbery has been launched and police are carrying out a range of inquires to try and track down the person responsible.
Officers say that the offender is to be 6’4” tall, of slim build and was wearing all black clothes. He was also said to have been carrying a black backpack.
Anyone with information is asked to contact police via the ‘Tell Us Something’ page of the Northumbria Police website or by calling 101 quoting log NP-20220211-1213.